John j



J J. H. PARROTT. Doubletree.

No. 227,049. Patented April 27,1830.

WITNESSES: INVENTOR: 6? a ,d/ W

Q BY My I ATTORNEYS.

N.FETERS, PHOTO-LITMOGRAPMER, WASHINGTON. D. C.

UNITED STATES PATENT OF ICE.

JOHN J. H. PARROTT, OF SALEM, OREGON, ASSIGNOR T0 HIMSELF AND WILLIAM H. LEININGER, OF SAME PLACE.

DOUBLE-TREE.

SPECIFICATION formingpart of Letters Patent No. 227,049, dated April 27, 1880. Applioation filed January 6, 1880.

To all whom it may concern:

Be it known that I, JOHN J. H. PARROTT, of Salem, in the county of Marion and State of Oregon, have invented a new and Improved Double-Tree, of which the followingis a specification.

Figure 1 is a plan of the device. Fig. 2 is a sectional elevation of the same on line 00 m, Fig. 1.

Similar letters of reference indicate corresponding parts.

The object of this invention is to provide a device to be applied to a vehicle whereby the hindmost horse shall be enabled to pull with more advantage than usual when endeavoring to draw abreast with the foremost horse.

The invention consists of a straight rack fixed centrally on the front edge of a doubletree and gearing into a corresponding seg ment-rack that is fixed on the tongue of the vehicle.

In the drawings, A represents a wagontongue, provided with a segmentrack and plate, A A, respectively. B is a double-tree, secured on the tongue A by the hammer-bolt b, which passes through the slot d and is held by the hammer-spring c. O is a straight rack formed on the edge of a slotted plate, 0, and fixed on the front edge of the double-tree B.

D D are single-trees, connected with the double-tree in the usual manner, to which single-trees the horses are attached in drawing the wagon.

The slot (1 in the rack G, extending through the double-tree B, permits the said double-tree B to move in such a manner that the rack G will readily gear into the rack A in whatever relative position the two may be. These plates and racks A G and A C, respectively, can be constructed to fit any tongues and doubletrees.

The advantage of this gearing is that when the horses pull evenly the draft will be on the hammer-bolt b, in the usual manner; but should one horselag behind the other, the hindmost one can, with this device, more easily pull up and come abreast with the foremost one, because the pivoting-point or fulcrum of the double-tree has become shifted from the hammer-bolt I) to those rack-teeth that are farthest from the said hindmost horse, and, consequently, he has a better leverage or purchase for pulling upon the double-tree than has the foremost horse.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- The combination, with tongue A and double-tree B, pivoted thereto, of a straight rack on the double-tree and a curved rack on the tongue, the strain being thrown upon the hammer-bolt until the double-tree turns, when it comes upon the racks, as and for the purpose specified.

JOHN J. H. PARROTT. Witnesses:

G. W. LAWSON,

W. B. MAGERS. 

